Messenger RNA (mRNA) {Ans: Interacts with the cell's protein-synthesizing machinery to direct production of a polypeptide, which folds into all or part of a protein.}Hydroxyl Group {Ans: (-OH) Polar due to electronegative oxygen. Forms hydrogen bonds with water, helping dissolve compounds such as sugars. Compound name: Alcohol Example: Ethanol}Carboxyl Group {Ans: (--COOH) Acts as an acid (can donate H+) because the covalent bond is between oxygen and hydrogen is so polar. Compound name: Carboxylic acid, or organic acid Example: Acetic acid: which gives vinegar its sour taste}Seven Chemical Groups Most Important in Biological Processes {Ans: Hydroxyl, carbonyl, carboxyl, amino, sulfate, hydroxyl, phosphate, and methyl.}Tertiary Structure {Ans: The overall shape of a polypeptide resulting from interactions between the side chains (R groups) of the various amino acids}Cohesion {Ans: Hydrogen bonds hold the substance together. Contributes to the transport of water and dissolved nutrients against gravity in plants.}